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Structure of the nuclear stellar cluster of the Milky Way galaxy

Published online by Cambridge University Press:  22 May 2014

Devaky Kunneriath
Affiliation:
Astronomical Institute, AS CR, Prague, Czech Republic email: devaky@astro.cas.cz
Rainer Schödel
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain
Susan Stolovy
Affiliation:
El Camino College, California, U. S. A.
Anja Feldmeier
Affiliation:
European Southern Observatory (ESO), Garching, Germany
Corresponding
E-mail address:
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Abstract

Nuclear star clusters are unambiguously detected in about 50–70% of spiral and spheroidal galaxies. They have typical half-light radii of 2–5 pc, dynamical mass ranging from 106 – 107 M, are brighter than globular clusters, and obey similar scaling relations with host galaxies as supermassive black holes. The nuclear stellar cluster (NSC) which surrounds Sgr A*, the SMBH at the center of our galaxy, is the nearest nuclear cluster to us, and can be resolved to scales of milliparsecs. The strong and highly variable extinction towards the Galactic center makes it very hard to infer the intrinsic properties of the NSC (structure and size). We attempt a new way to infer its properties by using Spitzer MIR images in a wavelength range 3–8 μm where the extinction is at a minimum, and the NSC clearly stands out as a separate structure. We present results from our analysis, including extinction-corrected images and surface brightness profiles of the central few hundred parsecs of the Milky Way.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

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